A:
according to the Sunnah (whatever is reported from the Prophet), the Tarawih Prayer is to be performed in the Masjid (mosque) as a congregational Salah, as the Prophet (peace be upon him) led the Muslims in this Salah for some nights in Ramadan. He (peace be upon him) led the Muslims in the Tarawih Prayer for three nights, but on the fourth night he did not go out to lead them, saying:
I feared that it (i.e. The Tarawih Prayer) might become obligatory for you.
During the era of Caliph
`Umar ibn Al-Khattab (may Allah be pleased with him), he saw people offering the Tarawih Prayer individually, so he believed that it was better to gather them behind one Imam (the one who leads congregational Prayer). As a result, he gave his orders to Ubay to lead people in the Tarawih Prayer, as the reason for which the Messenger (peace be upon him) abstained from continuing to observe this Salah as a congregational Salah was over. The Prophet's Sahabah (Companions - may Allah be pleased with them) unanimously agreed upon what was decided by
`Umar and saw that this practice is a revival of the Sunnah of the Prophet (peace be upon him). None of the earlier or contemporary scholars has been reported as contradicting this Sunnah. (Part No. 6; Page No. 80) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.